gemini-3-flash vs gemini-3.1-pro-preview Benchmark Comparison

Direct benchmark comparison between gemini-3-flash and gemini-3.1-pro-preview based on LMArena Elo and the latest 2026 API pricing.

Direct Technical & Pricing Comparison

Frontier Model	LMArena Elo	API Cost (1M)	Throughput
gemini-3-flash	1474	$5e-7	66
gemini-3.1-pro-preview	1490	$0.000002	60

*These models represent the Pareto Frontier (optimal cost-to-performance).*

Comparison Summary: These models are highly competitive, with a negligible Elo gap of only 16 points. The choice between them should be driven by specific API features or provider preference. Notably, both models are on the Pareto Frontier, representing a true trade-off between higher intelligence and lower cost.